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Although the term mainframe first described the physical characteristics of early systems, today it can best be used to describe a style of operation, applications, and operating system facilities.

Today, computer manufacturers don't always use the term mainframe to refer to mainframe computers. Instead, most have taken to calling any commercial-use computer— large or small— a server, with the mainframe simply being the largest type of server in use today. IBM®, for example, refers to its latest mainframe as the IBM System z9® server. We use the term mainframe in this section to mean computers that can support thousands of applications and input/output devices to simultaneously serve thousands of users.

Servers are proliferating. A business might have a large server collection that includes transaction servers, database servers, e-mail servers and Web servers. Very large collections of servers are sometimes called server farms (in fact, some data centers cover areas measured in acres). The hardware required to perform a server function can range from little more than a cluster of rack-mounted personal computers to the most powerful mainframes manufactured today.

A mainframe is the central data repository, or hub, in a corporation's data processing center, linked to users through less powerful devices such as workstations or terminals. The presence of a mainframe often implies a centralized form of computing, as opposed to a distributed form of computing. Centralizing the data in a single mainframe repository saves customers from having to manage updates to more than one copy of their business data, which increases the likelihood that the data is current.

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Mainframe computers are known as big machines which are used by large organizations like banking, finance, stock market, insurance etc. for hosting critical applications to perform bulk processing. This tutorial covers different topics associated with IBM mainframe. This tutorial covers some important concepts for mainframe beginners.

This tutorial is useful for software programmers who want to learn the basics of IBM Mainframe. Also, this tutorial will be helpful to mainframe professionals to increase their level of expertise.

The tutorial is useful for the readers, who have a basic knowledge of IBM mainfarme and associated technologies including DB2, CICS, COBOL, JCL, IMS DB, VSAM.

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